Ubuntu 22.04 LTS – Disk fills from runaway journald logs – Fix & Prevention

📖 ~1 min read

Table of contents

1. Symptom & Impact
2. Environment & Reproduction
3. Root Cause Analysis
4. Quick Triage
5. Step-by-Step Diagnosis
6. Solution – Primary Fix
7. Solution – Alternative Approaches
8. Verification & Acceptance Criteria
9. Rollback Plan
10. Prevention & Hardening
11. Related Errors & Cross-Refs
12. References & Further Reading

Symptom & Impact

System disk pressure grows rapidly and services fail from low space.

Environment & Reproduction

Usually linked to noisy services writing excessive journal entries.

Root Cause Analysis

journald retention limits are too high for available disk capacity.

Quick Triage

Identify top log producers and current journal footprint.

Step-by-Step Diagnosis

Analyze persistent journal settings and noisy unit frequency.

Solution – Primary Fix

Vacuum old journals and enforce size limits in journald.conf.

Solution – Alternative Approaches

Route verbose app logs to rotated files outside journald.

Verification & Acceptance Criteria

Disk usage stabilizes and journald remains within configured limits.

Rollback Plan

Restore previous journald.conf and restart journald.

Prevention & Hardening

Apply retention policy baseline and monitor log volume anomalies.

Related Errors & Cross-Refs

Related to rsyslog looped logging and repeated service crash loops.

Related tutorial: View the step-by-step tutorial for Ubuntu 22.04 LTS.

View all Ubuntu 22.04 LTS tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

Ubuntu systemd-journald retention and troubleshooting docs.